The main cause of this working is distance. Notice how close the subject is standing to the background and how far away the main light is from the subject. In this example, the subject is approximately 2 feet from the backdrop and the main light is approximately 4 feet from the subject. If you're new to this, I would recommend starting with your main light a bit further back to make it a little less challenging. You will see why in a second.
In the shot above I used a two light setup. The main light, camera left, is a Profoto D1 1,000Ws head inside of a 50 inch Westcott Apollo Softbox. While the idea of mixing what is considered to be a high-end strobe with a budget softbox my not sit right with some, I find the indirect lighting source from a Westcott or Photek to give a really nice and even light. The 60 inch Photek Softlighter, which I also enjoy using, may only cost $95 but gives a really nice, soft, and even light. If these lower cost indirect sources are good enough for the likes of Mario Testino and Annie Leibovitz, then they are good enough for me. Clay Cook did an great article on these lighting sources, "Lighting Like Leibovitz," that you can find here.
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